I found a new Bowser JR skip that is way easier. Just perform a Jump + Spin On my stream last night, at this time right here: All you need is to time a Jump + Spin Jump and hold D at the peak of your jump, which will teleport you to the top of the wall. This loses at most a second from the old setup, and I think it saves a second tbh. This makes Bowser JR MUCH easier.

When I coded this bug 3 years ago, I never foresaw that I would be using it in speedrunning.